Explosion-engine piston and piston-ring.



W. M. ROHN.

EXPLOSION. ENGINE PISTONAND PISTON RING. APPLICATION man ocT. 9. |916.

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therein to the accompanying drawing.

This invention relates to improvements in explosion engine' pistons, one object of the invention being the provision ofv means that willprevent the lubricating `oil from passing beyond a predetermined portionof the piston, namely, the lower packing ring, so that no carbonizing ofthe interior of the cylinder and spark plug will .be permitted.

A further object of the present invention is the provision of a pistonin which there is formed upon one wall of the lower piston ring recess agroove which' is in communication with the interior of the piston, so`that the surplus of lubricating oil can be taken care of during thereciprocation f the piston. .f

A still further object of the present invention is to provide acorresponding recess in the piston ring, so that as the piston ringmoves over the cylinder surface, the edge formed by the recess or grooveof the ringwill tend to scrape upon the downward movement of the pistonany surplus lubricant from the walls and direct the same into theannular recess formed by the two grooves and finally into the hollowportion of the piston, said combination of grooves also affording themeans to prevent the passage of the lubricant above certain portions ofthe cylinder -and preventingthe entrance thereof into the combustionchamber.`

In the accompanying drawings z- Figure 1 is a vertical'section through apiston, made according to and embodying the present invention.

Fig. 2 is a cross section taken online 2 2 of Fig. 1.

Fig. 3 is ,a bottom plan view of the lower piston ring per se.

Fig. 4 is a view in elevation thereof, and

Fig. 5 is a cross section on an enlarged scale through such piston ring.

Referring to the drawings, the numeral 6 designates the'complete piston,being provided with the rin grooves or recesses the lower one of whichas here shown is provided with the circumferential groove 8 inSpecicatioii ofiLetters Patent. i Application lled October 9,

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the lower wall of the recess 7. 'Leading from this groove 8 into thecavity of the piston, are the inclined openings or bores 9, which permitan egress for the lubricant.

The lower pistonring 10 has formed upon one face thereof, and such facebeing the one to oppose the groove 8, a groove 11, providing theoverhang rim`12.

Thus, when lthe piston ring 10 is assembledj in the piston, as shown inFig. 1, the two grooves 8` and 11 form a circumferential ca vity thefull circumference of the piston with an open mouth 13 between the outerlower edge of the ring and the lower wall of the recess 7.

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With this arrangement, the lubricating oil i is permitted -to enter thespace formed by the grooves 8 and 11, and finally the bores 9, so thatthe pressure of thepiston upon the compression or exhaust stroke, forceslthe lubricating oil through the bores 9, and 'prevents such oil frompassing tothe exterior top of the piston to cause carbonizing thereofand the spark plugs as well.

lt is also apparent that this arrangement will retain and permitsuiiicient oil to be supplied to lubricate the piston and cylinder andother working parts.

1. A piston having a ring recess, the wall of which is provided withacircular groove having openings leading therefrom intothe cavity of thepiston, and a piston ring lling said recess and having a circular grooveto oppose the groove of the piston to form therewith a circumferentialcavity.

2. A piston having a ring recessthe lower wall of which 'is providedwith a groove so as t combine with the groove of the piston to form acircumferential cavity with an annular mouth through the face of thepiston and packing ring.

4. rlhe combination with a piston having -'a ring recess, the lower wallof which is provided with a circular roove having o enings leadingtherefrom mto thel cavity o the piston, of a piston ring fttmg 1n saldrecess and havin a.l portion of the outer edge thereof adjacent to thecircular groove recessed to coperate with the groove of the piston toprevent the passage of the lubricant into the combustion chamberof theenne. gl. The combination with a piston having a ring recess, the lowerwallof which is provided with a circular groove having e ings leadingtherefrom mto the cavity o the piston, of a piston ring having acircumferential groove formed adjacent the outer j In y.testimonywhereof I aix niy signature. i

WILLIAM M. ROHN.

